package com.heima.media.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.dto.PageResponseResult;
import com.heima.common.dto.ResponseResult;
import com.heima.common.enums.AppHttpCodeEnum;
import com.heima.media.dto.ChannelDto;
import com.heima.media.entity.WmChannel;
import com.heima.media.mapper.WmChannelMapper;
import com.heima.media.service.IWmChannelService;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Date;

/**
 * <p>
 * 频道信息表 服务实现类
 * </p>
 */
@Service
public class WmChannelServiceImpl extends ServiceImpl<WmChannelMapper, WmChannel> implements IWmChannelService {

    @Override
    public ResponseResult listByName(ChannelDto dto) {
        // 构建查询条件
        LambdaQueryWrapper<WmChannel> query = new LambdaQueryWrapper<>();
        // 如果传入的频道名称不为空，加入频道查询条件
        if (!StringUtils.isEmpty(dto.getName())) {
            query.like(WmChannel::getName, dto.getName());
        }
        //构造分页条件
        IPage<WmChannel> page = new Page<>(dto.getPage(), dto.getSize());
        // 分页查询
        IPage<WmChannel> iPage = this.page(page, query);
        // 返回统一的分页响应对象
        PageResponseResult result = new PageResponseResult(dto.getPage(), dto.getSize(), iPage.getTotal(), iPage.getRecords());
        return result;
    }

    @Override
    public ResponseResult saveWmChannel(WmChannel entity) {
        //参数判断
        if (entity == null || StringUtils.isEmpty(entity.getName().trim())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        //新增频道
        //判断频道名称在数据库是否存在
        //根据频道名称查询
        LambdaQueryWrapper<WmChannel> query = new LambdaQueryWrapper<>();
        query.eq(WmChannel::getName, entity.getName());
        int count = this.count(query);
        //已经存在提示已存在
        if (count > 0) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_EXIST);
        }
        //否则保存新的频道
        entity.setCreatedTime(new Date());
        this.save(entity);
        return ResponseResult.okResult();
    }

}
